Archives

In the given diagram, name the point(s): (a) In the interior of ˆ DOE. (b) In the exterior of ˆ EOF (c) On ˆ EOF.

(a) Point interior of ∠DOE : A (b) Points exterior of ∠EOF : C,A,D (c) Points on ∠EOF : E,O,B,F... View Article

Describe with the help of a diagram, how compressions and rarefactions are produced in air near a source of sound.

When a vibrating body moves forward, it creates a region of high pressure in its vicinity. This region of high pressure is known as compressions.... View Article

A solar water heater cannot be used to get hot water on A) a sunny day B) a cloudy day C) a hot day D) a windy day

Option (B) a cloudy day Solar energy is the energy that we receive from the sun. Therefore, the heater will not get enough solar energy and... View Article

Will geographical isolation be a major factor in the speciation of a self-pollinating plant species? Why or why not?

In a self-pollinating plant species, geographical isolation cannot be a major factor in speciation because no new trait can become a part of the... View Article

Which has more number of atoms, 100 grams of sodium or 100 grams of iron (given, atomic mass of Na = 23 u, Fe = 56 u)?

Answer: Atomic mass of Na = 23 u Atomic mass of Fe = 56 u Then, gram atomic mass of Na = 23 g Now, 23 g of Na contains = 6.022 x 1023 g... View Article

Which of the following are matter? Chair, air, love, smell, hate, almonds, thought, cold, cold drink, smell of perfume.

Answer: Anything that occupies space and has mass is called matter. Matter can exist in three physical states which are Solid Liquid... View Article

The brain is responsible for: (A) Thinking. (B) Regulating the heart beat. (C) Balancing the body. (D) all of the above.

Correct Option : D The brain can be divided into three basic units: the forebrain, the midbrain, and the hindbrain. The brain directs our... View Article

What advantage over an aquatic organism does a terrestrial organism have with regard to obtaining oxygen for respiration?

Terrestrial organisms breathe by using atmospheric oxygen whereas aquatic organism takes oxygen dissolved in water. A terrestrial animal has over... View Article

Will geographical isolation be a major factor in the speciation of an organism that reproduces asexually? Why or why not?

In the case of an asexually reproducing organism, geographical isolation cannot be a major factor in speciation because meiosis does not occur... View Article

What is the difference between the manner in which movement takes place in a sensitive plant and the movement in our legs?

Movement in sensitive plant Movement in legs The movement is a sensitive response to stimulus(touch) Movement in our legs is a voluntary... View Article

Show how you would connect three resistors, each of resistance 6, so that the combination has a resistance of (i) 9, (ii) 4

It is given 3 resistors, each of which resistance 6Ω. The equivalent resistance of resistors in series is more than the individual resistance of... View Article

What are the advantages of connecting electrical devices in parallel with the battery instead of connecting them in series?

Answer: The battery is a device that consists of one or more electrochemical cells with external connections for powering electrical appliances... View Article

Generalize the rules for writing electronic configuration of the first eighteen elements found in the modern periodic table.

Following rules are to be followed to fill electrons in different energy levels. If n gives the number of orbit or energy level, then 2n gives... View Article

Classify each of the following as a homogeneous or heterogeneous mixture. Soda water, wood, air, soil, vinegar, filtered tea.

For answering this question, you should recall what homogeneous and heterogeneous mixtures are. If the mixture has one phase, it is homogeneous.... View Article

The autotrophic mode of nutrition requires: (a) carbon dioxide and water (b) chlorophyll. (c) sunlight. (d) all of the above.

Answer: (d) Autotrophic nutrition is a process where an organism prepares its own food from simple inorganic material like water, mineral salts... View Article

Determine if 25110 is divisible by 45. [Hint : 5 and 9 are co-prime numbers. Test the divisibility of the number by 5 and 9.]

We have 45 = 3 × 3 × 5 So, 45 = 5 × 9 Let's check if 25110 is divisible by 5 Since 25110 has 0 as its unit digit, therefore, 25110 is... View Article

An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm. Find the position and nature of image.

The focal length f = +15 cm, Object distance u = -10 cm From mirror formula 1/f = 1/v +1/u 1/v = 1/15 +1/10 1/v = 5/30 v = + 6 cm The... View Article

In which of the following expressions prime factorization has been done: (a) 24=2—3—4 (b) 56=7—2—2—2 (c) 70=2—5—7 (d) 54=2—3—9

Answer: Prime factorization is a process of factoring a number in terms of prime numbers i.e. the factors will be prime numbers. Prime... View Article

Write the formula to find the magnitude of the gravitational force between the earth and an object on the surface of the earth.

The gravitational force between the earth and an object is called the weight of the object. It is also equal to the product of acceleration due... View Article

Kanchan dyes dresses. She had to dye 30 dresses. She has so far finished 20 dresses. What fraction of dresses has she finished?

Total number of dresses =30 Work finished =20 Fraction of finished work = 20/30 =2/3 Therefore, 2/3 fraction of dresses has she finished dying... View Article

M	T	W	T	F	S	S
						1
2	3	4	5	6	7	8
9	10	11	12	13	14	15
16	17	18	19	20	21	22
23	24	25	26	27	28	29
30	31